Location Of Pv Load Center; Consumption Cts - enphase IQ8 Design Manual

3.3.2 Location of PV load center

Install the PV load center between the solar PV array and the existing distribution panel on site.
The PV load center location can be anywhere across the site. However, consider the following
when planning the location:
•
Distance from the existing distribution panel to which the PV load center is connected.
(Note VRise and PLC considerations).
•
Distance from PV arrays to the location of the PV load center.
•
Conductor sizing of the installed home run cabling system to the PV load center.
•
Route length distance on the same circuit between the first microinverter and the IQ
Gateway Commercial 2: Not more than 75 meters (246 feet) between the farthest
microinverter on the branch circuit and the gateway.
•
Accessibility for installers and for servicing.
•
Available space for installation.

3.4 Consumption CTs

•
Consumption monitoring is optional, and installers can order three Consumption
CTs capable of measuring up to 600 A continuous current with 2.5% accuracy.
•
The internal aperture of the split core Consumption CTs measures 50mm x 50mm to
support a maximum size of 300 KCMil THWN conductor.
•
Two 600 A Consumption CTs can be connected in parallel if needed with a
maximum of two CT wires per IQ Gateway Commercial 2 terminal block.
•
Do not install the Consumption CTs in a panel where they exceed 75% of the wiring
space of any cross- sectional area within the panel. (NEC 2017 312.8).
•
For net consumption metering, ensure there is sufficient room to install both CTs
around lines 1, 2, and 3 from the main feeds.
•
For total consumption metering, ensure there is sufficient room to install the CTs
around the lines that feed the consumption circuit.
•
You must use a protected route in conduit for the CT wires from the AC mains to the
IQ Gateway Commercial 2.
•
Consumption CTs lead extension: If needed, an electrician may extend the leads of
the Consumption CTs using the following guidance:
- WARNING! To extend the CT leads, the electrician must use appropriately rated, 18-14
AWG, twisted pair wire and install it in accordance with all applicable local electrical
codes and the National Electrical Code (NEC; NFPA 70).
- The electrician may add as much as three ohms round trip resistance to the
Consumption CT or up to 1.5 ohms per wire.
- Select a wire that is Code type, NRTL certified, and rated for voltage and temperature
for the specific application. Mechanically protect the wires in a Code type, NRTL-
certified conduit or raceway. Use NRTL-certified connectors for splices and insulated
splices from one another and from the raceway, conduit, or junction box if metallic.
- If you need to extend the leads, refer to the Enphase IQ Gateway Commercial 2
Installation and Operation Guide at enphase.com/support. Do not extend the leads
of the production CT.
31 © 2023 Enphase Energy Inc. All rights reserved.
IQ8 Commercial Microinverter grid-tied PV system
November 2023
USG-00026-1.0